In our SkyServer Projects, you will learn science by studying the
stars and galaxies of the Sloan Digital Sky Survey (SDSS) -
the same objects that professional astronomers study. Most
of these objects have never been seen before by human eyes.

Work through these projects at your own pace. Each consists of several
questions and exercises. If you get stuck, try
reading our About Astronomy or
About SDSS pages. The projects include downloadable Excel spreadsheets to help you
keep track of your data.

Each project
ends with a Research Challenge, which lets you do real astronomy research, just like thousands of professional
astronomers around the world. When you finish the Research Challenge for
each project, E-mail it to us. We'll look over all the results we get,
and we'll put the best up on these pages!